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The Range.startOffset read-only property returns a number representing where in the startContainer the Range starts.

If the startContainer is a Node of type Text, Comment, or CDATASection, then the offset is the number of characters from the start of the startContainer to the boundary point of the Range. For other Node types, the startOffset is the number of child nodes between the start of the startContainer and the boundary point of the Range.

To change the startOffset of a Range, use the Range.setStart method.

Syntax

startRangeOffset = range.startOffset;

Example

var range = document.createRange();
range.setStart(startNode,startOffset);
range.setEnd(endNode,endOffset);
var startRangeOffset = range.startOffset;

Specifications

Specification Status Comment
DOM
The definition of 'Range.startOffset' in that specification.
Living Standard No change.
Document Object Model (DOM) Level 2 Traversal and Range Specification
The definition of 'Range.startOffset' in that specification.
Recommendation Initial specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 1.0 (1.7 or earlier) 9.0 9.0 (Yes)
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) 1.0 (1.0) 9.0 9.0 (Yes)

See also

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